Proceedings of the Korean Institute of Building Construction Conference (한국건축시공학회:학술대회논문집)

The Korean Institute of Building Construction (한국건축시공학회)
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Analysis of Fire Damaged Concrete Ca(OH)2 by Heating Temperature Using Scanning Electron Microscope and X-ray Diffraction

SEM과 XRD를 이용한 수열온도별 화재피해 콘크리트의 Ca(OH)2 분석

  • 임군수 (청주대학교 건축공학과) ;
  • 한수환 (청주대학교 산학협력단) ;
  • 현승용 (청주대학교 산학협력단) ;
  • 김종 (청주대학교 건축공학과) ;
  • 한민철 (청주대학교 건축공학과) ;
  • 한천구 (청주대학교 건축공학과)
  • Published : 2022.11.10
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Abstract

In Korea, there is no clearly established technology for diagnosing and evaluating the damage depth of concrete structures created by fire. There have been cases of repairing, reinforcing, and demolishing degraded structures without diagnosing the damage depth. The commonly used phenolphthalein-based carbonate thickness measurement does not satisfy the complete disappearance condition of Ca(OH)2 in the interval where the relatively stationary flow declines after exposure to high temperatures. Even a small amount of Portlandite[Ca(OH)2] reacts with a red color, and the damage depth is misjudged. It was confirmed by X-ray diffraction and scanning electron microscope that Ca(OH)2 existed from 300℃ to 500℃ where the residual compressive strength decreased.

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